PHY 2048
Midterm Answers - DAY
Fall 2009
(B) ( 3.922 i$ 2.638 $ ) mN
j
1. (A) 4.726 mN
2. 6.364 W
3. 4.424 kg
4.
[ plus free-body diagrams like fig 4.12 and fig 5.2 with Tension ]
E
5. 0.5892 m
[solution should use Ef = Ei + W, where W = +10.5 J]
6. ( 6.3
PHY 2048
Midterm Exam
Spring 2011
2
Use g = 9.80 m/s .
1. [20 points]
A 56 kg astronaut drifting with a velocity of (+ 1.86 $ ) m/s is holding
j
a 9.86 kg module for the space station. She throws the module to another
astronaut at a velocity of ( 2.59 i$
NAME:
PHY 2048
Fall 2016
Exam 1A
You must show complete work to get credit for your answer.
Give answers to 3 or 4 signicant gures, and
express all vectors in standard z'A ,jA'JQ or ( , , ) notation.
Be sure to indicate your answer(s) clearly.
Use g = 9.8
LAB 08 Simple Harmonic Motion
James
11/04/14
PHY2048L Tuesday at 5:30 pm
Lab Station H
Partner: Liam
Abstract
The fraction of the spring mass that must be added to the hanging mass M, which
is 0.279 kg or about 1/5 of a kg, was calculated in post lab ques
LAB 09 Standing Waves On A String
James
11/17/14
PHY2048L Tuesday at 5:30 pm
Lab Station H
Partner: Liam
Abstract
Yes, the data that we collected was constant with what we expected between the
tension and the frequency of a n=3 standing wave. We know this
LAB 07 Moment of Inertia and Rotational Motion
James
10/28/14
PHY2048L Tuesday at 5:30 pm
Lab Station H
Partner: Liam
Abstract
Yes, our data does confirm Newtons 2ed Law for rotation. In this experiment we
calculated an r value of 1.00 in the first run an
LAB 05 Ballistic Pendulum and Projectile Motion
James
10/7/14
PHY2048L Tuesday at 5:30 pm
Lab Station D
Partner: None
Abstract
The speed of the ball fired by the spring-powered launcher was calculated to be
(6.429 0.03701)m/s for the pendulum and (6.429 .
LAB 03 Newton's Second Law On An Air Track
James
9/23/14
PHY2048L Tuesday at 5:30 pm
Lab Station D
Partner: Diana
Abstract
Yes, our data was consistent with Newton's Second Law, but poorly. In our lab we calculated
that our known M Total = (0.3700.005)kg
LAB 06 Torques & Rotational Equilibrium
James
10/21/14
PHY2048L Tuesday at 5:30 pm
Lab Station D
Partner: None
Abstract
Yes, my data is consistent with the torque counterclockwise equals torque
clockwise creating equilibrium. All of our data in this exper
PHY 2048
Midterm Exam - DAY
Fall 2010
2
Use g = 9.80 m/s and G = 6.67 10-11 Nm2/kg2 .
1. [15 points]
A 7.65 kg mass moves with a velocity given by the function
v(t) = (5t3 7t2 11) m/s. What is the force acting on this mass?
Give your answer as a function
PHY 2048
Midterm Exam
Spring 2010
2
Use g = 9.80 m/s and G = 6.67 10-11 Nm2/kg2 .
1. [15 points]
A wagon of mass 7.21 kg has an initial velocity of + 2.87 i$ m/s. If the wagon
comes to rest after moving 5.88 i$ m, what force acted on it? Assume the force
PHY 2048
Midterm Answers
Spring 2010
Note: These are answers, not complete solutions.
1. 5.050 i$ N
2. 67.70 J
3. (A)
(B) 40.06 m/s
4. False: Velocity can change direction while speed is constant.
5. (4.918 i$ 1.245 $ ) m/s
j
6. 195.9 nN
7. (A) ( 17.71 i$
PHY 2048
Midterm Answers - DAY
Fall 2010
1. ( 115 t2 107 t ) N
2. T = F / sin(2) [free-body diagram like Wolfson problem 5-35]
[ energy - collision - energy or constant a ]
3. 2.291 m
4. 5.778 s
5. False. It can if F is perpendicular to v, as in circular
g = 9.80 m/s
2
G = 6.67 10 11 Nm2 / kg 2
( 9.81 m/s 2 )
MEarth = 5.97 1024 kg
REarth = 6.37 106 m
Moments of inertia (about the CM unless noted otherwise)
hoop or cylindrical shell: MR
2
2
1
disk or solid cylinder: 2 MR
1
2
2
hollow cylinder: 2 M ( R1 + R
PHY 2048
Exam
SAMPLE
Sometime
You must show complete work to get credit for a problem solution.
Be sure to indicate your assumptions and answer(s) clearly.
Give all results to 3 or 4 significant figures.
Specify all vectors in i, j, k component notation
PHY 2048
Midterm Exam - DAY
Use g = 9.80 m/s .
Fall 2008
1. [20 points] A 7.83 kg mass slows down from 48.7 m/s to 29.8 m/s while sliding 32.3 m. Find its acceleration and the time it took for this to happen. Give your well-organized calculation below. In
PHY 2048
Use g = 9.80 m/s
Midterm Exam
G = kg
Spring 2009
m
1. [10 points] The angular position of a 3.7 kg disk is given by = ( 6t3 8t2 + 5 ) rad, where t is in s. What is its angular velocity at t = 2.14 s?
2. [10 points] A 3.75 kg mass is hung on a spr
PHY 2048
Midterm Exam - DAY
Fall 2009
2
Use g = 9.80 m/s and G = 6.67 10-11 Nm2/kg2 .
1. [15 points]
A mass M (837 kg) is at the origin and a
mass m (372 kg) is located at the point
x = 0.055 m, y = 0.037 m as shown.
(A) Find the magnitude of the gravitat
LAB 01 Uniformly Accelerated Motion
James
9/9/14
PHY2048L Tuesday at 5:30 pm
Lab Station D
Partner: Diana
The answer to the question, what is gravity in our lab, was found during our
experiment. We found that gravity for a mass of (0.542 0.005)kg in our
u